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Title: The {sup 13}C-pocket structure in AGB models: constraints from zirconium isotope abundances in single mainstream SiC grains

We present postprocess asymptotic giant branch (AGB) nucleosynthesis models with different {sup 13}C-pocket internal structures to better explain zirconium isotope measurements in mainstream presolar SiC grains by Nicolussi et al. and Barzyk et al. We show that higher-than-solar {sup 92}Zr/{sup 94}Zr ratios can be predicted by adopting a {sup 13}C-pocket with a flat {sup 13}C profile, instead of the previous decreasing-with-depth {sup 13}C profile. The improved agreement between grain data for zirconium isotopes and AGB models provides additional support for a recent proposal of a flat {sup 13}C profile based on barium isotopes in mainstream SiC grains by Liu et al.
Authors:
; ;  [1] ; ;  [2] ;  [3]
  1. Department of the Geophysical Sciences, The University of Chicago, Chicago, IL 60637 (United States)
  2. Dipartimento di Fisica, Università di Torino, Torino I-10125 (Italy)
  3. Chicago Center for Cosmochemistry, Chicago, IL 60637 (United States)
Publication Date:
OSTI Identifier:
22356566
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 788; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; ASYMPTOTIC SOLUTIONS; CARBON 13; COMPUTERIZED SIMULATION; ELEMENT ABUNDANCE; GIANT STARS; METEORITES; METEOROIDS; NUCLEAR REACTIONS; NUCLEOSYNTHESIS; SILICON CARBIDES; STARS; ZIRCONIUM 92; ZIRCONIUM 94